[PROFESSOR FATE]

This is not a common problem on FE motors. If the pin sheared, it was probably caused by something other than the pin. Those gears are supposed to be a press fit on the distributor shaft. If not, there is an excessive load placed on the pin. If the gear spun on the shaft, the proper press fit is definitely history. If there is still some interference, you might be able to get away with using Loctite when you reassemble, but you're taking a chance even with an oversize pin. Also, I would think twice about going to a 3/16 pin. The bigger you make that pin, the more you reduce the cross sectional area of the shaft, and the weaker it gets. If the gear is properly installed on the shaft, redrilling and replacing the stock 1/8 roll pin with a 5/32 roll pin should provide a substancial increase is shear strength without overly weakening the shaft.